My temps are 82-85 on the cool side and at the uth it is 90 using a rheostat. I also have acu-rite humidity/temp. monitors and I use a temperature gun to spot check. (Yeah I know a bit overkill but I just happen to have the temperature gun and I'm ocd with my snakes.) All three are in separate tanks. I feed them weekly on Sunday. Dude is 120g and gets two rat fuzzies. Nagini is approximately 2700g and she gets two medium rats. Sirius is about 1400g and gets one medium rat.

Honestly, I don't see how they could scent the dog. It just seems highly unlikely but it so strange they started this behavior at the same time.